Recently published Ornithological Works. 493 



have enabled them to separate the old Chamaa fasciata 

 into four " subspecies/' which are distributed over different 

 districts of Western North America. 



The characters of the new genera, species, and subspecies 

 introduced in the present volume have been already published 

 by Mr. Ridgway in the ' Proceedings of the Biological 

 Society of Washington * for 1903 (see ' Ibis/ 1904, p. 301). 



The number of species and subspecies treated in the 

 present volume is about 450. Some 800 others have been 

 described in the two previous volumes, and, according to the 

 calculations made by the author, about 1875 species more 

 remain. This would bring up the total number of species 

 and subspecies of Birds in North and Middle America, ac- 

 cording to Mr. Ridgway's estimate, to about 3125. We fear, 

 therefore, that Mr. Rid g way has still a very heavy task before 

 him. Although we may not agree with all the author's 

 views on classification, we must all admire the thoroughness 

 and accuracy of his work, aud trust that it may be brought 

 to an early conclusion. 



81. Rules of Zoological Nomenclature. 



[Regies Internationales de la Nomenclature Zoologique adoptees par 

 les Cong-res Internationaux de Zoologie. International Rules of Zoo- 

 logical Nomenclature. Internationale Regeln der zoologisclien Nomtn- 

 klatur. Paris : F. R. de Rudeval, 1905. 8vo. 64 pp.] 



In the " Avant-Propos " of this Memoir, which is written 

 in French, and is signed by Prof. Blanchard, the various steps 

 taken by the Congress of Zoology for the preparation of 

 the " International Rules of Zoological Nomenclature " are 

 shortly but plainly set forth. The Committee on the subject 

 was originally established at the Congress of Berlin in 1895, 

 and the Code adopted was finally elaborated by MM. 

 Blanchard (of Paris), von Maehrenthal (of Berlin), and Stiles 

 (of Washington) at Berne, after the Congress held in that 

 city in August 1904. After the Introduction follow the Rules 

 in three languages — French, English, and German, — the first 

 of the three texts being stated to be the most authoritative 

 in case of any dispute. 



SK11. VIII. — VOL. V. 2 L 



